wp_get_nav_menu_object()is located in wp-includes/nav-menu.php. to get the menu by its name. use below code:
wp_nav_menu( array( 'menu' => 'your menu mane here', // pt the name of the menu that you have created in admin. 'theme_location' => '__no_such_location' 'fallback_cb' => false ) );Just Copy and paste the above code where you want to show your menus.